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Geothermal Gradient Map of North America (Sheet 1 of 2)
$ 14.00
1 map on 2 sheets :col. ;183 x 153 cm., sheets 102 x 161 cm
Depths shown by contours
"Prepared by the Geothermal Survey of North America, Subcommittee of the AAPG Research Committee."
Bipolar oblique conic conformal proj. (E 170 -- W 9/N 90 -- N 6)
- Sheet Measures 102 x 161 cm
- Depths shown by contours